Hopefuls Strip Down for 'Baywatch' Reboot Auditions in Sexy Casting Call Video

"Baywatch" is back ... and so are the babes! TMZ was at the casting call to capture all the chaos as the beach filled with L.A.'s finest -- and we don't mean the cops! 😏 Watch the video ... the worlds of BBLs, double-Ds and CPR all collided…